8 Surprising Health Benefits of Kissing You Never Knew Existed

The prospect of cooties didn’t bother me in kindergarten when I pinned down my crush at recess and laid one on him (though I was a little disappointed that he cried and stormed off toward the water fountain). Fortunately my kissing abilities and understanding of consent have both improved since then, and it turns out that even if cooties are real, they might actually be good for your health. Seriously—making out has some very real, science-backed benefits that you can read about below.

1. Kissing is good for your teeth—as long as the two of you are fairly hygienic

According to Sivan Finkel, a cosmetic dentist in New York City, kissing leads to increased saliva production, which helps our teeth rid themselves of harmful bacteria. “The extra saliva helps remineralize teeth and protect them from acid attacks,” he says.

Even better, some experts believe that saliva's mineral ions can promote the repair of small lesions in tooth enamel—but again, oral hygiene is key. “Before you swap [spit], check their breath, and if they pass the sniff test, then kiss away,” Dr. Finkel says.

2. Kissing can give your immune system a boost

More than 700 types of bacteria have been found in the human mouth, but no two people have the exact same makeup of oral germs, so exchanging saliva with someone can introduce new “foreign” bacteria into your body, which isn't a bad thing.

“Trillions of microorganisms live on or inside us, and collectively they're known as the microbiome,” says Shilpa Ravella, M.D., a gastroenterologist and an assistant professor of medicine at Columbia University Medical Center. Dr. Ravella points to a recent Dutch study that found that when we kiss for more than 10 seconds, about 80 million bacteria are transferred between us and our partner, which can introduce new and sometimes helpful bacteria into our mouths. “Many studies have shown that having a variety of bacterial species correlates with good health. A diverse microbiome can help regulate the immune system and protect against harmful germs.”

We’ll take that over a booster shot any day.

3. Kissing can lower anxiety

From a chemical standpoint, one of the primary health benefits of kissing is its ability to release the hormone oxytocin (known as the love hormone), according to Stephanie Hartselle, M.D., an assistant professor of psychiatry at Brown University, who cites its ability to induce a sense of calm, relaxation, and bonding in humans. The hormone, which is also released during foreplay and orgasm, “has been shown to be as powerful as meditation and many antianxiety medications in producing a feeling of peace and contentment,” Dr. Hartselle says.

Bet you never knew making out could help ease itchy symptoms that come with nasal or skin allergies.

Stay with us on this one: In 2006 allergist Hajime Kimata studied 24 patients with two types of allergies—mild atopic eczema (a skin allergy) and mild allergic rhinitis (a nasal allergy)—before and after they had kissed lovers or spouses for 30 minutes while listening to soft music.

"Usually, when you have an allergy, your body overreacts by producing IgE, an antibody to a specific allergen," says Srini Pillay, M.D., a Harvard psychiatrist. "But in these groups, after kissing, this antibody was decreased, thereby decreasing the allergic reaction and symptoms."

5. Kissing can help lower blood pressure

According to Ryan Neinstein, M.D., a plastic surgeon in New York City, our lips are made up of blood vessels, which become dilated during kissing. “The blood is then directed toward the face and away from the rest of the body," he says, "so the demand on the heart goes down, resulting in lower blood pressure."

Also, remember that fact about cortisol? When your cortisol level is lower, so is your blood pressure. "The more you kiss, the more your heart races, and the more your blood flows, ultimately reducing high blood pressure,” Dr. Neinstein says.

6. Kissing can help delay signs of aging

Another reason to kiss as much as possible: The increased blood flow to your face can stimulate collagen production and contribute to antiaging. "The higher blood flow increases the number of small blood vessels helping to nourish the machinery of the skin,” Dr. Neinstein says. It also stimulates the production of collagen and elastin, which is the substance “that beautiful skin is made of.”

“In order to move your lips, your whole face has to get involved, which increases elasticity," Dr. Neinstein says. "Have you seen face yoga or facercises? There are yogis, estheticians, and dermatologists training women to do exercises for their face to stimulate collagen and lessen the need for a face-lift. Passionate kissing can lead to firming the face, especially its bottom half.”

7. Kissing is kind of like a treadmill—for your face

While a “simple” kiss burns only a calorie or two, tongue kissing uses all the muscles in your face and can burn up to 26 calories per minute.

“There are 43 muscles in your face and eight in your tongue,” Dr. Hartselle says. “Kissing increases the blood supply to those areas by dilation of the vessels, and it’s possible that the muscle workout, combined with the facial flushing, in extended kissing sessions allows your facial muscles to be healthier and revitalized.”

8. It increases your sex drive

This one may seem obvious, but Rachel Abrams, M.D., an integrative health expert and author, points out that testosterone—the hormone responsible for sex drive in both women and men—is released into saliva during prolonged kissing.

“In a study, males were more likely than females to initiate open-mouth kissing and kissing with tongue contact, and male saliva contains measurable amounts of the sex hormone testosterone, which can affect libido,” Dr. Abrams says. “Testosterone is also an antidepressant, and it helps with mental focus.”

Another fun fact: Women who kiss other women also exchange testosterone, since we’ve got it too. So whether your partner is male or female, you're sharing hormones and pheromones.